Christoph Niemann's sons Arthur, 5, and Gustav, 3, are obsessed with the New York City subway system - so he decided to draw a set of illustrations depicting their love for and adventures on the subway train!

A chaperone on one of Arthur’s school trips told me something he overheard when all the kids were neatly lined up in rows of two. The girl holding Arthur’s hand asked him, “Have you heard of Peter Pan?” “No,” he replied, “have you heard of Metro North?”

Our kids are also obsessed with subway systems, even with the crowds! We've been taking them since they were tiny, so for them it is second nature but it seems each time we go it is a new adventure for them. I think the more crowded the better in their little minds because they get to see so many different people.

We did a recent post about this on our site...with suggestions for how parents can make it a smooth ride.